PSO TESTElectrical

1. ____ is defined as the measure of instrument by which it is error freeA. AccuracyB. PrecisionC. ResolutionAns: Accuracy

2. A _____ meter is used a null detector in wheatstone bridgeA. AmmeterB. VoltmeterC. GalvanometerAnswer: Galvanometer

3. A moving iron ammeter coil has few turns of thick wire in order to have:A. Low resistanceB. High sentivityC. Effective dampingD. Large scaleAnswer: A

4. A permanent magnet coil meter has which featuresA. Low power consumptionB. no hysteresis lossC. reduced eddy currentD. reduced dampingE. allAns: E

5. The EM field and current are concentrated close to the surface of the conductor. The phenomenon is called?Ans: Skin Effect

6. The wavelength of an EM wave after reflection at an angle on a surfaceAns: Increases in the actual direction of propagation

7. When electric field is parallel to the plane of incidence, the electromagnetic wave is said to beAns: Parallel polarized

8. x H = J + D isAns: Maxwell equation

9. Bucholz relay is used in Ans: Transformer Protection

10. Solid grounding is used for voltagesa. above 220 kVb. above 11 kVc. below 660 Vd. below 115 VAnswer: C11. Maximum Cross over distortion inAnswer: Class B

12. The channel of a JFET is between theA. Gate and drainB. Drain and sourceC. Gate and sourceD. Input and outputAnswer: B

13. Velocity saturation in MOSFET is

14. Which type of engine uses maximum air fuel ratioA. Petrol engineB. Gas engineC. Diesel engineD. Gas turbineE. Hydro turbineAns: Gas turbine

15. If ROC (Region of Convergence) does not converge

16. In LTI system is characterized byA. Impulse inputB. Step inputAns: Impulse Response

17. Which thing happens in gas discharge lampsAnswer: Ionization in vapor or gas

18. Continuous signal in the time domain in frequency domain

19. Which of the following relay is used in Motor for protectionAnswer: Thermal relay

20. In z transform cos pi/4 is the period is equal toAns: N=8

21. Which system used dc to dc high voltage gainA. Solar systemB. Battery backup

22. Power plant the availability of power is least forA. WindB. SolarC. TidalD. GeothermalE. Bio gassAns: Wind Energy

23. A diode that has a negative resistance characteristics is theA. Schottkey diodeB. Tunnel diodeC. Hot-carrier diodeD. Laser diodeE. Zener DiodeAnswer: B

24. We built control systems for _______1) remote control,2) stability, 3) overcomingdisturbances, $) All of aboveAns: All

25. Natural frequency of a system gives1) nature of transient2) overshoot3) oscillation4) speed of responseAns: speed of response (not sure)

26. Hay bridge is used for the measurement ofAns: Inductance

27. ____ bridge used for the measurement of resistanceAns: Wheatstone bridge

28. _____ acts as voltage controlled variable capacitorAns: Varactor

29. By which a meter after checking with no current returns to its previous stateAns: Controlling Torque

30. By connecting a shunt of higher value in ammeter what will decreaseAns: Current sensitivity decreases

31. If z transform lies in ROC thenA. System is stableB. Inverse of system is stableC. Both system and its inverse are unstableD. Both system and its inverse are stable

32. Under damped response have1) damping ratio>12) 0>damping ratio